[tex] > \: resolucao \\ \\ \geqslant \: progressao \: \: aritmetica \\ \\ r = a2 - a1 \\ r = 7 - 4 \\ r = 3 \\ \\ = = = = = = = = = = = = = = = = \\ \\ > \: termo \: geral \: \\ \\ an = a1 + (n - 1)r \\ an = 4 + (n - 1)3 \\ an = 4 + 3n - 3 \\ an = 3n + 1 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \geqslant [/tex]
